Why PEG-8000?
Why NaCl?
PEG and NaCl are contributing to precipitate the virions, usually achieved by incubation at low temperature. If we were not precipitating virions, they would not pellet even few hours at 10k rpm.
http://c.ask.nate.com/imgs/knsi.php/381588/11/11.gif
thank u .... Philippe
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